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Verified answer
I = ibua = ayah
ibu : ayah = 5 : 7
i = 5/7 a (pers 1)
ayah - ibu = 12 tahun
a - i = 12 (pers 2)
substitusi pers 1 ke pers 2
a - 5/7a = 12
2/7a = 12
a = 12 × 7/2 = 42 (pers 3)
substitusi pers 3 ke pers 2
a - i = 12
42 - i = 12
42 - 12 = i
i = 30
ayah = 42 tahun
ibu = 30 tahun
semoga membantu :)
5:7
→ 7-5
→ 2
Maka:
- IBU
→ 5/2 × 12
→ 60/2
→ 30 thn
- AYAH
→ 7/2 × 12
→ 84/2
→ 42 thn
Umur ibu → 30 thn dan ayah adalah → 42 thn
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